In a digital telephony network, the signal of human voice needs to be sampled and digitized...
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In a digital telephony network, the signal of human voice needs to be sampled and digitized before transmission. It is found that limiting the bandwidth of human voice to 3100 Hz would be enough to ensure good-quality phone calls. a) Human voice contains frequency components above 3100 Hz. How can we ensure that the voice signal will only occupy a bandwidth of 3100 Hz? (4 marks) b) The sampling rate is determined to be 50% higher than the Nyquist sampling rate. Determine the sampling rate. (3 marks) c) A pulse-code modulation (PCM) scheme is used to represent the digitized voice signal, where 8 bits are used for each sample. Determine the data rate of a single voice call. (4 marks) d) Time-division multiplexing (TDM) is used to aggregate a maximum of 20 voice calls in a telephone line. Determine the maximum data rate that you can observe over a telephone line. (4 marks) e) Determine the minimum required bandwidth of the telephone line that can support a maximum of 20 phone calls. (2 marks) f) Explain what synchronization is in a TDM system and why do we need synchronization in a TDM system. (4 marks) g) Now, suppose a frequency division multiplexing (FDM) system is to be built to support 20 phone calls in a given geographic area, where a single sideband amplitude modulation scheme (SSB AM) with a sufficiently large carrier frequency is used for each phone call. What is the minimum required bandwidth for the FDM system that can avoid mutual interference among the phone calls? (4 marks) In a digital telephony network, the signal of human voice needs to be sampled and digitized before transmission. It is found that limiting the bandwidth of human voice to 3100 Hz would be enough to ensure good-quality phone calls. a) Human voice contains frequency components above 3100 Hz. How can we ensure that the voice signal will only occupy a bandwidth of 3100 Hz? (4 marks) b) The sampling rate is determined to be 50% higher than the Nyquist sampling rate. Determine the sampling rate. (3 marks) c) A pulse-code modulation (PCM) scheme is used to represent the digitized voice signal, where 8 bits are used for each sample. Determine the data rate of a single voice call. (4 marks) d) Time-division multiplexing (TDM) is used to aggregate a maximum of 20 voice calls in a telephone line. Determine the maximum data rate that you can observe over a telephone line. (4 marks) e) Determine the minimum required bandwidth of the telephone line that can support a maximum of 20 phone calls. (2 marks) f) Explain what synchronization is in a TDM system and why do we need synchronization in a TDM system. (4 marks) g) Now, suppose a frequency division multiplexing (FDM) system is to be built to support 20 phone calls in a given geographic area, where a single sideband amplitude modulation scheme (SSB AM) with a sufficiently large carrier frequency is used for each phone call. What is the minimum required bandwidth for the FDM system that can avoid mutual interference among the phone calls? (4 marks) In a digital telephony network, the signal of human voice needs to be sampled and digitized before transmission. It is found that limiting the bandwidth of human voice to 3100 Hz would be enough to ensure good-quality phone calls. a) Human voice contains frequency components above 3100 Hz. How can we ensure that the voice signal will only occupy a bandwidth of 3100 Hz? (4 marks) b) The sampling rate is determined to be 50% higher than the Nyquist sampling rate. Determine the sampling rate. (3 marks) c) A pulse-code modulation (PCM) scheme is used to represent the digitized voice signal, where 8 bits are used for each sample. Determine the data rate of a single voice call. (4 marks) d) Time-division multiplexing (TDM) is used to aggregate a maximum of 20 voice calls in a telephone line. Determine the maximum data rate that you can observe over a telephone line. (4 marks) e) Determine the minimum required bandwidth of the telephone line that can support a maximum of 20 phone calls. (2 marks) f) Explain what synchronization is in a TDM system and why do we need synchronization in a TDM system. (4 marks) g) Now, suppose a frequency division multiplexing (FDM) system is to be built to support 20 phone calls in a given geographic area, where a single sideband amplitude modulation scheme (SSB AM) with a sufficiently large carrier frequency is used for each phone call. What is the minimum required bandwidth for the FDM system that can avoid mutual interference among the phone calls? (4 marks)
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This set of questions revolves around the concepts of digital signal processing telephone networking and multiplexing Lets answer each question stepbystep a To ensure that the voice signal will only o... View the full answer
Related Book For
Essentials Of Business Statistics
ISBN: 9780078020537
5th Edition
Authors: Bruce Bowerman, Richard Connell, Emily Murphree, Burdeane Or
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